| 摘要 |
PROBLEM TO BE SOLVED: To provide a gas concentration measurement apparatus, for reducing errors in a concentration output value of a detection objective gas even, in the case of a drastic change of an ambient temperature or the like causing a large error in the measured concentration. SOLUTION: This gas concentration measurement device is provided with an element measurement means 2 for measuring an output of a gas detection element 1, a heating means 3, a temperature detection element 4, a temperature measurement means 5 for measuring an ambient temperature of the temperature detection element 4, a concentration computing means 6 for computing a concentration computed value by using the element output value measured by the element measurement means 2 and a temperature measurement value measured by the temperature measurement means 5, and a concentration outputting means 8 for outputting the concentration computed value to the outside. By means of a concentration error determining means 7 for determining the dimension of an error in the concentration computed value outputted from the concentration computing means 6 by using a temperature change speed as a reference, it is determined that a large error is caused in the concentration computed value, if the temperature change speed is above a reference value, and a next previous concentration computed value is maintained and outputted to the concentration outputting means 8. If the temperature change speed is below the reference value, it is determined that the error in the concentration computed value is small, and then the latest concentration computed value is outputted to the concentration outputting means 8. |
